Queen Mathilde of Belgium attend a conference on Ebola on March 3, 2015 in Brussels

Queen Mathilde of Belgium (C) walks with crutches as she arrives along with EU foreign policy chief Federica Mogherini (L) to attend a conference on Ebola on 03.03.2015 in Brussels. Leaders of Ebola-hit countries in west Africa attend an international conference in Brussels on March 3 to mobilise a final push to end the outbreak and ensure the delivery of nearly $5 billion in aid pledges. Queen Mathilde of Belgium injured her left knee after a fall.

Queen Mathilde of Belgium (C) walks with crutches as she arrives along with EU foreign policy chief Federica Mogherini (L) to attend a conference on Ebola on 03.03.2015 in Brussels.

Queen Mathilde of Belgium (L) talks with Guinean President Alpha Conde (not seen) during a conference on Ebola on 03.03.2015 in Brussels.

Queen Mathilde of Belgium attends a conference on Ebola on 03.03.2015 in Brussels.

Queen Mathilde of Belgium (C) walks with crutches as she arrives along with EU foreign policy chief Federica Mogherini (L) to attend a conference on Ebola on 03.03.2015 in Brussels.  Belgian Queen Mathilde injured her left knee after a fall.

Queen Mathilde of Belgium (L), walking with crutches, arrives to attend a conference on Ebola on 03.03.2015 in Brussels.

(From L) Congo's President Denis Sassou NGuesso, Queen Mathilde of Belgium and EU foreign policy chief Federica Mogherini pose as they arrive attend a conference on Ebola on 03.03.2015 in Brussels.

Queen Mathilde of Belgium, walking with crutches after a knee injury following a fall, arrives to attend a conference on Ebola on 03.03.2015 in Brussels. Leaders of Ebola-hit countries in west Africa attend an international conference in Brussels on March 3 to mobilise a final push to end the outbreak and ensure the delivery of nearly $5 billion in aid pledges.

Queen Mathilde of Belgium, walking with crutches after a knee injury following a fall, arrives to attend a conference on Ebola on 03.03.2015 in Brussels.

Queen Mathilde of Belgium, holding her crutches after a knee injury following a fall, arrives to attend a conference on Ebola on 03.03.2015 in Brussels.

Queen Mathilde of Belgium (C), sitting in a wheelchair, following a knee injury, arrives to attend a conference on Ebola on 03.03.2015 in Brussels.